{"id":8234490,"date":"2026-10-24T17:32:15","date_gmt":"2026-10-24T17:32:15","guid":{"rendered":"https:\/\/scn.eu\/?post_type=scn_guide&#038;p=8234490"},"modified":"2026-10-24T17:33:59","modified_gmt":"2026-10-24T17:33:59","slug":"nataggregat-industri","status":"publish","type":"scn_guide","link":"https:\/\/scn.eu\/sv\/guider\/nataggregat-industri\/","title":{"rendered":"N\u00e4taggregat f\u00f6r industrin \u2013 DIN-skena, DC\/DC och UPS"},"content":{"rendered":"<div class=\"scn-guide\">\n<h1>N\u00e4taggregat f\u00f6r industrin \u2013 DIN-skena, DC\/DC och UPS<\/h1>\n<p class=\"g-lead\">Ett n\u00e4taggregat som \u00e4r f\u00f6r litet eller f\u00f6r varmt kan stoppa en hel maskin. Guiden visar hur du dimensionerar, kyler och s\u00e4krar 24 V-matningen, och n\u00e4r du beh\u00f6ver redundans, UPS eller DC\/DC-omvandlare.<\/p>\n<div class=\"g-short\"><b class=\"t\">Kort svar<\/b><\/p>\n<ul>\n<li><b>Dimensionera med marginal<\/b> \u2013 summera lasterna, ta h\u00e4nsyn till startstr\u00f6mmar och l\u00e4gg till ungef\u00e4r 20\u201330 %.<\/li>\n<li><b>V\u00e4rmen avg\u00f6r livsl\u00e4ngden<\/b> \u2013 \u00f6ver en viss temperatur m\u00e5ste effekten s\u00e4nkas (derating).<\/li>\n<li><b>Redundans<\/b> \u2013 med tv\u00e5 aggregat och en redundansmodul g\u00e5r matningen vidare om det ena g\u00e5r s\u00f6nder. Parallellkoppling f\u00f6r mer effekt ger ingen reserv.<\/li>\n<li><b>S\u00e4kringarna m\u00e5ste l\u00f6sa ut<\/b> \u2013 utan str\u00f6mreserv l\u00f6ser automats\u00e4kringen ofta inte ut vid kortslutning.<\/li>\n<li><b>UPS och buffertmoduler<\/b> \u2013 \u00f6verbryggar avbrott, fr\u00e5n sekunder med kondensatorer till timmar med batteri.<\/li>\n<\/ul>\n<\/div>\n<h2>Hur fungerar ett switchat n\u00e4taggregat?<\/h2>\n<p>N\u00e4stan alla n\u00e4taggregat i elsk\u00e5p \u00e4r i dag switchade. N\u00e4tsp\u00e4nningen likriktas och sl\u00e5s sedan till och fr\u00e5n med h\u00f6g frekvens, vilket g\u00f6r att transformatorn kan bli liten. D\u00e4refter likriktas och filtreras sp\u00e4nningen, och en regulator h\u00e5ller utsp\u00e4nningen stabil.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-natagg-f1-sv.webp\" alt=\"Blockschema \u00f6ver ett switchat n\u00e4taggregat: EMC-filter, likriktare med PFC, h\u00f6gfrekvent switchsteg, transformator f\u00f6r galvanisk isolation och likriktare med filter, med \u00e5terkoppling som h\u00e5ller utsp\u00e4nningen konstant\" width=\"1520\" height=\"440\" loading=\"lazy\" decoding=\"async\"><figcaption>Fr\u00e5n n\u00e4tsp\u00e4nning till stabil 24 V DC i fem steg.<\/figcaption><\/figure>\n<p>Transformatorn skiljer utg\u00e5ngen galvaniskt fr\u00e5n n\u00e4tet, s\u00e5 att 24 V-sidan kan r\u00e4knas som klensp\u00e4nning (SELV eller PELV). Utrustning p\u00e5 det allm\u00e4nna eln\u00e4tet ska klara \u00f6vertonsgr\u00e4nserna i EN 61000-3-2, som g\u00e4ller fr\u00e5n 75 W. D\u00e4rf\u00f6r har st\u00f6rre aggregat effektfaktorkorrigering (PFC).<\/p>\n<h2>Hur stort n\u00e4taggregat beh\u00f6ver du?<\/h2>\n<p>Summera str\u00f6mmen f\u00f6r alla laster p\u00e5 24 V: PLC, I\/O, givare, ventiler, rel\u00e4er och paneler. L\u00e4gg till ungef\u00e4r 20\u201330 % marginal f\u00f6r framtida utbyggnad och svalare drift.<\/p>\n<h3>Startstr\u00f6mmar och effektreserv<\/h3>\n<p>Laster med stora kondensatorer p\u00e5 ing\u00e5ngen, till exempel industridatorer och DC\/DC-omvandlare, drar en kraftig str\u00f6mpuls vid tillslag. DC-motorer, magnetventiler och bromsar drar flera g\u00e5nger sin m\u00e4rkstr\u00f6m n\u00e4r de startar.<\/p>\n<p>Tv\u00e5 saker i databladet \u00e4r viktiga. <b>Effektreserv (boost)<\/b> betyder att aggregatet kan ge till exempel 150 % av m\u00e4rkeffekten i n\u00e5gra sekunder. <b>\u00d6verlastbeteendet<\/b> avg\u00f6r resten: konstant str\u00f6mbegr\u00e4nsning matar full str\u00f6m tills lasten har startat, medan ett aggregat som sl\u00e5r av och f\u00f6rs\u00f6ker igen (hiccup-l\u00e4ge) kanske aldrig f\u00e5r ig\u00e5ng en stor kapacitiv last.<\/p>\n<div class=\"g-short\">\n<p style=\"margin:0\">Exempel: 12 A kontinuerlig last plus 25 % marginal ger 15 A. Ett aggregat p\u00e5 24 V och 480 W (20 A) r\u00e4cker, medan 240 W (10 A) \u00e4r f\u00f6r litet.<\/p>\n<\/div>\n<h2>Enfas eller trefas, och vilket insp\u00e4nningsomr\u00e5de?<\/h2>\n<p>Upp till n\u00e5gra hundra watt r\u00e4cker oftast enfas. Ett brett insp\u00e4nningsomr\u00e5de, till exempel 85\u2013264 V AC, fungerar \u00f6ver hela v\u00e4rlden, och m\u00e5nga aggregat klarar \u00e4ven liksp\u00e4nning.<\/p>\n<p>Vid h\u00f6gre effekt \u00e4r trefas vanligare. Aggregaten belastar faserna j\u00e4mnt och klarar ofta 340\u2013550 V AC, allts\u00e5 b\u00e5de 400 och 480 V.<\/p>\n<p>24 V DC \u00e4r standard i automation, medan 48 V anv\u00e4nds i telekom och f\u00f6r PoE. I sm\u00e5 elsk\u00e5p r\u00e4knas bredden i moduler om 17,5 mm, och ultrasmala aggregat fr\u00e5n en modul passar i installationscentraler och fastighetsautomation.<\/p>\n<h2>Verkningsgrad, v\u00e4rme och montering<\/h2>\n<p>Vid 480 W uteffekt och 94 % verkningsgrad blir f\u00f6rlusterna ungef\u00e4r 31 W. Vid 88 % blir de 65 W \u2013 dubbelt s\u00e5 mycket v\u00e4rme i sk\u00e5pet.<\/p>\n<p>M\u00e4rkeffekten g\u00e4ller upp till en viss omgivningstemperatur, ofta 50\u201360 \u00b0C, och d\u00e4refter m\u00e5ste effekten s\u00e4nkas enligt databladets kurva. Tumregeln \u00e4r att elektrolytkondensatorernas livsl\u00e4ngd halveras f\u00f6r varje 10 \u00b0C h\u00f6gre temperatur.<\/p>\n<p>Aggregat f\u00f6r DIN-skena kyls oftast med sj\u00e4lvdrag. Montera dem i det l\u00e4ge databladet anger, med fritt utrymme ovanf\u00f6r och under. Liggande montering eller en frekvensomriktare t\u00e4tt intill kan kr\u00e4va kraftig derating.<\/p>\n<h2>Redundans och selektivitet \u2013 n\u00e4r matningen inte f\u00e5r g\u00e5 ner<\/h2>\n<p>I processindustri, vattenverk och tunnlar f\u00e5r matningen inte f\u00f6rsvinna f\u00f6r att ett aggregat g\u00e5r s\u00f6nder. L\u00f6sningen \u00e4r N+1-redundans: tv\u00e5 aggregat som vart och ett klarar hela lasten, kopplade via en redundansmodul. Modulen skiljer utg\u00e5ngarna \u00e5t med dioder eller MOSFET (OR-ing), s\u00e5 att ett trasigt aggregat inte drar ned det friska. Anslut b\u00e5da aggregatens DC OK-kontakter, annars m\u00e4rker ingen n\u00e4r det ena g\u00e5r s\u00f6nder.<\/p>\n<p>Parallellkoppling med str\u00f6mdelning ger mer effekt, men ingen reserv om lasten kr\u00e4ver alla aggregaten.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-natagg-f2-sv.webp\" alt=\"Kopplingsschema i block: tv\u00e5 n\u00e4taggregat matar en redundansmodul som skiljer dem \u00e5t. Modulen och en DC-UPS med batteri matar en 24 V-buss, och varje last har en egen s\u00e4kring\" width=\"1520\" height=\"560\" loading=\"lazy\" decoding=\"async\"><figcaption>N+1-redundans med DC-UPS och en s\u00e4kring per lastgrupp.<\/figcaption><\/figure>\n<p><b>Selektivitet<\/b> betyder att bara s\u00e4kringen till den felande kretsen l\u00f6ser ut. En automats\u00e4kring med B-karakteristik beh\u00f6ver 3\u20135 g\u00e5nger m\u00e4rkstr\u00f6mmen f\u00f6r att l\u00f6sa ut momentant, och C-karakteristik 5\u201310 g\u00e5nger. Ett aggregat p\u00e5 10 A f\u00e5r d\u00e4rf\u00f6r aldrig en B6-s\u00e4kring att l\u00f6sa ut snabbt, och sp\u00e4nningen sjunker f\u00f6r alla laster under tiden. Anv\u00e4nd ett aggregat som ger en kort str\u00f6mpuls p\u00e5 flera g\u00e5nger m\u00e4rkstr\u00f6mmen, eller elektroniska s\u00e4kringar per utg\u00e5ng.<\/p>\n<h2>UPS och buffertmoduler f\u00f6r 24 V DC<\/h2>\n<p>Ett vanligt n\u00e4taggregat h\u00e5ller utsp\u00e4nningen uppe ungef\u00e4r 20 ms efter ett avbrott. F\u00f6r l\u00e4ngre avbrott beh\u00f6vs n\u00e5got mer:<\/p>\n<ul>\n<li><b>Buffertmodul med kondensatorer<\/b> \u2013 underh\u00e5llsfri, f\u00f6r avbrott p\u00e5 upp till n\u00e5gra sekunder.<\/li>\n<li><b>DC-UPS med batteri<\/b> \u2013 en styrenhet laddar batteriet och kopplar in det vid avbrott. R\u00e4cker minuter eller timmar, s\u00e5 att en PLC eller dator hinner st\u00e4nga ned kontrollerat.<\/li>\n<li><b>UPS (avbrottsfri kraft) f\u00f6r v\u00e4xelsp\u00e4nning<\/b> \u2013 f\u00f6r datorer och utrustning som kr\u00e4ver 230 eller 115 V AC.<\/li>\n<\/ul>\n<div class=\"g-short\">\n<p style=\"margin:0\">Blybatterier \u00e5ldras snabbt i varma elsk\u00e5p. V\u00e4lj en styrenhet med batteritest och larmkontakt, och byt batteriet regelbundet.<\/p>\n<\/div>\n<h2>DC\/DC-omvandlare f\u00f6r fordon, t\u00e5g och f\u00f6rsvar<\/h2>\n<p>En DC\/DC-omvandlare g\u00f6r om en varierande batterisp\u00e4nning till en stabil sp\u00e4nning, till exempel 24 V till 12 V f\u00f6r en radio.<\/p>\n<ul>\n<li><b>Fordon och mobila maskiner<\/b> \u2013 sp\u00e4nningen sjunker vid motorstart och stiger kraftigt vid lastbortkoppling (load dump), som beskrivs i ISO 16750-2. V\u00e4lj ett brett insp\u00e4nningsomr\u00e5de, till exempel 9\u201336 V.<\/li>\n<li><b>Isolerad eller icke-isolerad<\/b> \u2013 en isolerad omvandlare bryter jordslingor. En icke-isolerad \u00e4r mindre men har gemensam minuspol med batteriet.<\/li>\n<li><b>J\u00e4rnv\u00e4g<\/b> \u2013 EN 50155 st\u00e4ller krav p\u00e5 temperatur, sp\u00e4nningsvariationer, avbrott, vibration och EMC vid 24, 72 eller 110 V DC.<\/li>\n<li><b>F\u00f6rsvar och flyg<\/b> \u2013 MIL-omvandlare f\u00f6r 28 V, konstruerade f\u00f6r transienterna i MIL-STD-1275 (markfordon) och MIL-STD-704 (flyg), ofta basplattekylda.<\/li>\n<\/ul>\n<h2>Vilka godk\u00e4nnanden beh\u00f6vs?<\/h2>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Standard<\/th>\n<th>Omfattar<\/th>\n<th>Typisk anv\u00e4ndning<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">EN 62368-1<\/td>\n<td>Els\u00e4kerhet f\u00f6r IT- och AV-utrustning, har ersatt EN 60950-1<\/td>\n<td>Automation, IT och telekom<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">UL 508 eller UL 61010-2-201<\/td>\n<td>Els\u00e4kerhet f\u00f6r industriell styrutrustning i Nordamerika<\/td>\n<td>Export till USA och Kanada<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">IEC 60601-1<\/td>\n<td>Medicinsk elutrustning: isolation och l\u00e4ckstr\u00f6m, till exempel 2 \u00d7 MOPP<\/td>\n<td>Medicinteknik<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">EN 50155<\/td>\n<td>Elektronik i rullande materiel<\/td>\n<td>Sp\u00e5rfordon<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">EN 61000-6-2 och -6-4<\/td>\n<td>EMC: immunitet och emission i industrimilj\u00f6<\/td>\n<td>Utrustning i elsk\u00e5p<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">MIL-STD-461, -704 och -1275<\/td>\n<td>EMC och matningskvalitet f\u00f6r f\u00f6rsvarsmateriel<\/td>\n<td>Milit\u00e4ra fordon, flyg och fartyg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>Anv\u00e4ndningsexempel och vanliga misstag<\/h2>\n<ul>\n<li><b>Fabrik<\/b> \u2013 24 V till PLC, I\/O, givare och ventiler.<\/li>\n<li><b>Fordon och mobila maskiner<\/b> \u2013 DC\/DC-omvandlare f\u00f6r 12 och 24 V i skogsmaskiner, truckar, bussar och utryckningsfordon.<\/li>\n<li><b>Energi och infrastruktur<\/b> \u2013 aggregat med DC-ing\u00e5ng i st\u00e4llverk, DC-UPS i pumpstationer och tunnlar.<\/li>\n<li><b>Medicinteknik<\/b> \u2013 aggregat enligt IEC 60601-1.<\/li>\n<li><b>F\u00f6rsvar<\/b> \u2013 MIL-omvandlare och UPS f\u00f6r fordon och fartyg.<\/li>\n<\/ul>\n<ol class=\"g-pit\">\n<li><b>Dimensionerat efter kontinuerlig last.<\/b> Startstr\u00f6mmar kan ge \u00f6verlast vid varje tillslag.<\/li>\n<li><b>Derating gl\u00f6ms bort.<\/b> Ett aggregat i ett 60 \u00b0C varmt sk\u00e5p kan bara ge en del av m\u00e4rkeffekten.<\/li>\n<li><b>Parallellkoppling tas f\u00f6r redundans.<\/b> Utan redundansmodul och reserv tar ett fel ned hela matningen.<\/li>\n<li><b>S\u00e4kringen l\u00f6ser inte ut.<\/b> Kontrollera att aggregatet kan ge tillr\u00e4cklig str\u00f6m f\u00f6r att l\u00f6sa ut s\u00e4kringen.<\/li>\n<\/ol>\n<h2>N\u00e4taggregat hos SCN<\/h2>\n<p>Vi har n\u00e4taggregat f\u00f6r DIN-skena fr\u00e5n Mean Well och Mibbo och DC-UPS fr\u00e5n Mean Well. F\u00f6r f\u00f6rsvar, flyg och fartyg har vi DC\/DC-omvandlare, hold-up-moduler och UPS fr\u00e5n Enercon.<\/p>\n<h3>Exempel ur v\u00e5rt sortiment<\/h3>\n<div class=\"g-prod\"><a class=\"g-pc\" href=\"https:\/\/scn.eu\/sv\/produkt\/sdr-480p-sv\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/SDR-480P.png\" alt=\"Mean Well SDR-480P DIN-skenen\u00e4taggregat, en utg\u00e5ng, PFC och parallellfunktion, 480 W\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Mean Well<\/span><span class=\"g-pn\">SDR-480P DIN-skenen\u00e4taggregat, en utg\u00e5ng, PFC och parallellfunktion, 480 W<\/span><span class=\"g-pw\">480 W med aktiv PFC, 94 % verkningsgrad, 150 % effektreserv, DC OK-kontakt och str\u00f6mdelning.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/sv\/produkt\/mlr-ultra-slim-din-rail-power-supply-sv\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/mibbo-mlr-main.webp\" alt=\"Mibbo MLR ultrasmalt n\u00e4taggregat f\u00f6r DIN-skena\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Mibbo<\/span><span class=\"g-pn\">MLR ultrasmalt n\u00e4taggregat f\u00f6r DIN-skena<\/span><span class=\"g-pw\">Fr\u00e5n 17,5 mm bredd, 15\u2013150 W, 85\u2013264 V AC eller 120\u2013370 V DC in \u2013 f\u00f6r sm\u00e5 elsk\u00e5p.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/sv\/produkt\/enercon-m8727-sv\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/enercon-m8727-main.webp\" alt=\"Enercon M8727 80 W DC\/DC-omvandlare med tv\u00e5 utg\u00e5ngar\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Enercon<\/span><span class=\"g-pn\">M8727 80 W DC\/DC-omvandlare med tv\u00e5 utg\u00e5ngar<\/span><span class=\"g-pw\">F\u00f6r 28 V-system i markfordon och flyg: 18\u201348 V DC in, \u221255 till +85 \u00b0C, konstruerad f\u00f6r MIL-STD-1275 och MIL-STD-704.<\/span><\/a><\/div>\n<div class=\"g-links\"><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/komponenter-sv\/power-supplies-sv\/\">Str\u00f6mf\u00f6rs\u00f6rjning<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/komponenter-sv\/power-supplies-sv\/single-phase-sv\/\">Enfasiga n\u00e4taggregat<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/komponenter-sv\/power-supplies-sv\/3-phase\/\">Trefasiga n\u00e4taggregat<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/komponenter-sv\/power-supplies-sv\/dc-dc-mil\/\">DC\/DC MIL<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/komponenter-sv\/power-supplies-sv\/ups\/\">UPS<\/a><\/div>\n<div class=\"g-cta\">\n<p>Os\u00e4ker p\u00e5 hur stort aggregat du beh\u00f6ver, eller hur du bygger en redundant 24 V-matning? Fr\u00e5ga en av v\u00e5ra ingenj\u00f6rer \u2013 du f\u00e5r svar inom 24 timmar.<\/p>\n<p><a href=\"https:\/\/scn.eu\/sv\/kontakt\/\">Fr\u00e5ga en ingenj\u00f6r<\/a><\/div>\n<h2>Vanliga fr\u00e5gor<\/h2>\n<details>\n<summary>Hur stort n\u00e4taggregat beh\u00f6ver jag?<\/summary>\n<p>Summera lasterna, ta h\u00e4nsyn till startstr\u00f6mmar och l\u00e4gg till 20\u201330 % marginal. Kontrollera att effekten g\u00e4ller vid temperaturen i sk\u00e5pet.<\/p>\n<\/details>\n<details>\n<summary>Vad \u00e4r skillnaden mellan ett linj\u00e4rt och ett switchat n\u00e4taggregat?<\/summary>\n<p>Ett linj\u00e4rt aggregat omvandlar \u00f6verskottet till v\u00e4rme. Det ger lite brus men har l\u00e5g verkningsgrad. Ett switchat aggregat \u00e4r mindre och mer effektivt.<\/p>\n<\/details>\n<details>\n<summary>Kan man parallellkoppla tv\u00e5 n\u00e4taggregat?<\/summary>\n<p>Ja, om aggregaten \u00e4r gjorda f\u00f6r det och har str\u00f6mdelning. F\u00f6r redundans beh\u00f6vs dessutom en redundansmodul och att varje aggregat ensamt klarar hela lasten.<\/p>\n<\/details>\n<details>\n<summary>Vad \u00e4r skillnaden mellan en DC-UPS och en buffertmodul?<\/summary>\n<p>En buffertmodul lagrar energi i kondensatorer och klarar avbrott p\u00e5 upp till n\u00e5gra sekunder utan underh\u00e5ll. En DC-UPS anv\u00e4nder ett batteri och klarar minuter eller timmar, men batteriet m\u00e5ste kontrolleras och bytas.<\/p>\n<\/details>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Ett n\u00e4taggregat som \u00e4r f\u00f6r litet eller f\u00f6r varmt kan stoppa en hel maskin. Guiden visar hur du dimensionerar, kyler och s\u00e4krar 24 V-matningen, och n\u00e4r du beh\u00f6ver redundans, UPS eller DC\/DC-omvandlare.<\/p>\n","protected":false},"author":11,"featured_media":8234479,"template":"","meta":{"_yoast_wpseo_focuskw":"n\u00e4taggregat","_yoast_wpseo_metadesc":"S\u00e5 v\u00e4ljer du n\u00e4taggregat f\u00f6r industrin: dimensionering, startstr\u00f6mmar, derating, redundans, selektivitet, DC-UPS, DC\/DC-omvandlare och 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